Total Cloud Cover Average Cloud Amount (%) January (1954 - 1997) Night, Ship Observations Only Global Average: 68.6 Zonal Averages 17 zones Lat.N Average 85 57.0 75 67.1 65 80.5 55 81.6 45 79.2 35 70.4 25 59.6 15 52.4 5 63.3 -5 61.7 -15 63.6 -25 62.5 -35 67.7 -45 78.8 -55 87.8 -65 88.8 -75 79.8 Grid Box Averages 369 filled boxes Box # Lat.N Lon.E Average 1 85 60 61.3 2 85 180 52.9 4 75 20 81.3 5 75 60 72.2 8 75 180 51.0 9 75 220 63.7 12 75 340 71.2 13 65 10 79.0 14 65 30 78.8 21 65 170 84.2 22 65 190 83.0 23 65 210 63.2 28 65 310 76.7 29 65 330 81.0 30 65 350 81.1 31 55 10 75.3 32 55 30 78.0 38 55 150 78.5 39 55 170 83.3 40 55 190 81.7 41 55 210 82.9 42 55 230 82.0 46 55 310 87.9 47 55 330 81.7 48 55 350 77.3 49 45 5 54.5 50 45 15 60.9 51 45 25 67.7 52 45 35 69.4 54 45 55 69.4 62 45 135 56.2 63 45 145 76.1 64 45 155 83.3 65 45 165 79.8 66 45 175 81.6 67 45 185 81.0 68 45 195 80.8 69 45 205 83.3 70 45 215 82.4 71 45 225 81.1 72 45 235 76.2 77 45 285 60.5 78 45 295 76.5 79 45 305 84.2 80 45 315 85.7 81 45 325 81.8 82 45 335 80.5 83 45 345 77.7 84 45 355 74.5 85 35 5 55.0 86 35 15 58.1 87 35 25 58.3 88 35 35 55.7 96 35 115 28.4 97 35 125 62.8 98 35 135 68.8 99 35 145 69.7 100 35 155 75.6 101 35 165 73.3 102 35 175 73.6 103 35 185 72.7 104 35 195 74.5 105 35 205 75.8 106 35 215 78.6 107 35 225 77.2 108 35 235 66.3 109 35 245 49.1 112 35 275 61.2 113 35 285 68.1 114 35 295 78.2 115 35 305 74.0 116 35 315 70.1 117 35 325 71.0 118 35 335 70.8 119 35 345 66.1 120 35 355 47.4 124 25 35 27.9 125 25 45 41.6 126 25 55 30.8 127 25 65 24.5 132 25 115 70.5 133 25 125 75.4 134 25 135 67.0 135 25 145 63.0 136 25 155 61.7 137 25 165 61.7 138 25 175 61.2 139 25 185 62.5 140 25 195 61.8 141 25 205 62.0 142 25 215 68.2 143 25 225 74.3 144 25 235 74.3 145 25 245 49.2 146 25 255 48.0 147 25 265 64.5 148 25 275 56.9 149 25 285 55.7 150 25 295 52.8 151 25 305 52.9 152 25 315 56.1 153 25 325 57.3 154 25 335 53.1 155 25 345 37.5 160 15 35 36.2 161 15 45 29.3 162 15 55 35.9 163 15 65 36.8 164 15 75 24.4 165 15 85 40.8 166 15 95 37.1 167 15 105 64.0 168 15 115 59.2 169 15 125 61.5 170 15 135 62.8 171 15 145 60.2 172 15 155 53.4 173 15 165 50.8 174 15 175 51.7 175 15 185 55.4 176 15 195 55.9 177 15 205 55.4 178 15 215 63.4 179 15 225 69.7 180 15 235 74.2 181 15 245 67.6 182 15 255 40.9 183 15 265 25.8 184 15 275 45.9 185 15 285 42.8 186 15 295 44.0 187 15 305 48.6 188 15 315 52.1 189 15 325 60.7 190 15 335 56.4 191 15 345 40.2 193 5 5 60.4 197 5 45 41.6 198 5 55 48.9 199 5 65 48.1 200 5 75 43.3 201 5 85 61.5 202 5 95 65.1 203 5 105 67.2 204 5 115 68.4 205 5 125 65.4 206 5 135 68.0 207 5 145 67.1 208 5 155 67.0 209 5 165 71.4 210 5 175 68.5 211 5 185 69.4 212 5 195 63.3 213 5 205 64.5 214 5 215 69.1 215 5 225 70.2 216 5 235 67.4 217 5 245 69.7 218 5 255 63.2 219 5 265 59.5 220 5 275 52.5 221 5 285 50.0 223 5 305 59.4 224 5 315 71.0 225 5 325 73.3 226 5 335 70.1 227 5 345 48.6 228 5 355 57.8 229 -5 5 70.5 230 -5 15 60.6 233 -5 45 50.1 234 -5 55 58.9 235 -5 65 65.9 236 -5 75 68.3 237 -5 85 69.1 238 -5 95 73.8 239 -5 105 77.3 240 -5 115 78.3 241 -5 125 72.7 242 -5 135 75.3 243 -5 145 73.8 244 -5 155 71.5 245 -5 165 73.0 246 -5 175 71.3 247 -5 185 65.6 248 -5 195 59.2 249 -5 205 47.6 250 -5 215 42.8 251 -5 225 41.8 252 -5 235 40.5 253 -5 245 48.4 254 -5 255 57.9 255 -5 265 65.0 256 -5 275 70.5 257 -5 285 50.0 260 -5 315 62.1 261 -5 325 52.9 262 -5 335 52.5 263 -5 345 57.0 264 -5 355 62.8 265 -15 5 81.9 266 -15 15 59.2 268 -15 35 52.8 269 -15 45 57.7 270 -15 55 62.4 271 -15 65 61.7 272 -15 75 64.9 273 -15 85 60.8 274 -15 95 65.7 275 -15 105 63.7 276 -15 115 55.3 277 -15 125 64.8 278 -15 135 74.0 279 -15 145 71.1 280 -15 155 62.8 281 -15 165 63.3 282 -15 175 67.9 283 -15 185 68.7 284 -15 195 72.0 285 -15 205 65.2 286 -15 215 58.0 287 -15 225 50.7 288 -15 235 54.9 289 -15 245 54.1 290 -15 255 63.7 291 -15 265 69.4 292 -15 275 75.2 293 -15 285 61.1 297 -15 325 53.6 298 -15 335 54.5 299 -15 345 62.3 300 -15 355 73.5 301 -25 5 76.7 302 -25 15 52.2 304 -25 35 56.4 305 -25 45 55.6 306 -25 55 56.4 307 -25 65 58.4 308 -25 75 59.2 309 -25 85 61.8 310 -25 95 71.8 311 -25 105 69.1 312 -25 115 43.0 316 -25 155 63.2 317 -25 165 61.5 318 -25 175 65.3 319 -25 185 66.8 320 -25 195 72.7 321 -25 205 73.3 322 -25 215 69.2 323 -25 225 55.4 324 -25 235 53.5 325 -25 245 53.1 326 -25 255 59.9 327 -25 265 67.0 328 -25 275 75.7 329 -25 285 69.5 332 -25 315 61.9 333 -25 325 58.1 334 -25 335 51.8 335 -25 345 52.0 336 -25 355 63.4 337 -35 5 70.3 338 -35 15 47.0 339 -35 25 60.6 340 -35 35 65.2 341 -35 45 63.4 342 -35 55 67.4 343 -35 65 72.6 344 -35 75 68.9 345 -35 85 70.6 346 -35 95 75.3 347 -35 105 69.8 348 -35 115 51.0 349 -35 125 65.5 350 -35 135 60.1 351 -35 145 56.9 352 -35 155 63.6 353 -35 165 70.1 354 -35 175 61.9 355 -35 185 66.1 356 -35 195 68.9 357 -35 205 74.0 358 -35 215 75.7 359 -35 225 80.2 360 -35 235 68.2 361 -35 245 64.8 362 -35 255 76.0 363 -35 265 75.2 364 -35 275 75.9 365 -35 285 59.6 367 -35 305 54.8 368 -35 315 58.9 369 -35 325 68.8 370 -35 335 72.0 371 -35 345 71.6 372 -35 355 68.3 373 -45 5 82.4 374 -45 15 81.4 375 -45 25 83.8 376 -45 35 86.1 377 -45 45 77.3 378 -45 55 82.3 379 -45 65 83.2 380 -45 75 82.3 381 -45 85 84.0 382 -45 95 85.6 383 -45 105 82.8 384 -45 115 79.5 385 -45 125 85.6 386 -45 135 85.3 387 -45 145 69.4 388 -45 155 74.2 389 -45 165 79.8 390 -45 175 66.5 391 -45 185 74.6 392 -45 195 79.5 393 -45 205 77.7 394 -45 215 79.5 399 -45 265 81.0 400 -45 275 76.9 401 -45 285 76.3 402 -45 295 51.0 403 -45 305 57.6 404 -45 315 74.0 405 -45 325 77.1 406 -45 335 80.3 407 -45 345 82.7 408 -45 355 84.9 409 -55 10 91.1 410 -55 30 88.2 411 -55 50 89.9 412 -55 70 89.4 413 -55 90 91.7 414 -55 110 87.3 415 -55 130 87.0 416 -55 150 90.6 417 -55 170 86.8 418 -55 190 86.8 419 -55 210 89.4 420 -55 230 90.4 421 -55 250 86.1 422 -55 270 84.3 423 -55 290 76.6 424 -55 310 81.6 425 -55 330 89.3 426 -55 350 91.6 427 -65 10 83.9 428 -65 30 69.5 429 -65 50 81.5 430 -65 70 83.0 431 -65 90 88.5 432 -65 110 82.7 433 -65 130 87.2 434 -65 150 90.7 435 -65 170 91.5 436 -65 190 91.7 437 -65 210 95.2 438 -65 230 96.2 439 -65 250 95.4 440 -65 270 95.5 441 -65 290 86.5 442 -65 310 90.4 443 -65 330 94.6 444 -65 350 87.4 449 -75 180 70.4 450 -75 220 91.9 452 -75 300 77.5 453 -75 340 81.4